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2 years ago

How does negative work on a system occur?

Physics

1 answer:

ad-work [718]2 years ago

5 0

Answer:

The negative work is done in the opposite direction of the movement.

Explanation:

When the force applied to the body acts contrary to the movement of the body, it is considered that a negative mechanical work is performed.

In the attached image, we can see how these forces acting over one body.

In the sketch we can see how the force is moving the block to the right, it means in the direction of the movement and the friction force is acting in the opposite direction of the movement, that is the reason that the work is negative.

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Question 5

Ksenya-84 [330]

Answer:

The force of the nail pushing in the opposite direction

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2 years ago

A 0.50 kg toy is attached to the end of a 1.0 m very light string. The toy is whirled in a horizontal circular path on a frictio

xenn [34]

Answer:

The maximum speed will be 26.475 m/sec

Explanation:

We have given mass of the toy m = 0.50 kg

radius of the light string r = 1 m

Tension on the string T = 350 N

We have to find the maximum speed without breaking the string

For without breaking the string tension must be equal to the centripetal force

So $T=\frac{mv^2}{r}$

So $350=\frac{0.5\times v^2}{1}$

$v^2=700$

v = 26.475 m /sec

So the maximum speed will be 26.475 m/sec

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2 years ago

The acceleration due to gravity is g at the earth's surface. an earth satellite is orbiting at a distance from the earth's surfa

disa [49]

The acceleration due to gravity is g/4

The acceleration above the earth surface is given by the relation

g^'=gr^2/〖(h+r)〗^2

Since the satellite orbits the earth in a orbit of radius equal to earth radius, therefore

g^'=(gr^2)/〖(r+r)〗^2 =g/4

Thus the acceleration due to gravity on the satellite is g/4.

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2 years ago

How do you find the direction of displacement?

andreyandreev [35.5K]

You draw a straight line from the start point to the end point. It doesn't matter what route was actually followed for the trip.

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3 years ago

What determines if a star turns into a red giant or a red supergiant?

mixer [17]

Answer:

Explanation:

As stars age, they evolve away from the main sequence to become red giants or supergiants. The core of a red giant is contracting, but the outer layers are expanding as a result of hydrogen fusion in a shell outside the core. The star gets larger, redder, and more luminous as it expands and cools.

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